Shure AONIC 50 Wireless Noise-Canceling Headphones (White) - Manual (Page 6)

Shure Incorporated
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Active noise cancellation
Active Noise Cancellation (ANC) allows you to suppress some or all of the noise around you. This is especially useful when
travelling where road noise in a car, bus, or train, or jet noise in an airplane can force you to increase the volume.
To use ANC, push the vertical switch on the back of the right earcup to the down position.
In the ShurePlus PLAY app, you can adjust the ANC between two levels:
Max
Normal